A Cluster Method for One-Dimensional Quantum Spin Systems at Finite Temperatures

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概要

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• A method, which incorporates the effects of long-range fluctuations into a singlethree-spin custer, is presented. The basic idea is to consider overlapping clusters in achain, in order to equally treat all neighboring three spins and also to take account ofthe long-range correlations beyond the cluster size. An approximate decimation isemployed, by which all spins of the chain are successively decimated and a renor-malized three-spin cluster is obtained. Numerical calculations of the internal energiesand the specific heats for spin 1 /2 systems are presented, and show that the present ap-proximation is valid for T: J /k..

• 社団法人日本物理学会の論文
• 1986-05-15

著者

• Kojyo Norimichi

  Department Of Physics Tokyo Metropolitan University

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